The dipole moment of the lowest Π bending state of (HCN)2 has been determined by tunable far-infrared Stark spectroscopy to be 6.023(31) D. This represents a reduction in dipole moment of 0.54(5) D relative to the ground state, which is over five times too large for simple harmonic oscillations of uncoupled rods. Although qualitative comparison with related systems suggests the possibility of a secondary minimum near the T-shaped configuration, electrostatic modeling does not support the existence of such a feature.
|Original language||English (US)|
|Number of pages||11|
|Journal||Journal of molecular spectroscopy|
|State||Published - Apr 1995|